Double-head milling-machine



C. L. HUST ON.

DOUBLE HEAD. MILLING MACHINE. APPLICATION FILED APR.20. 1 918.

1,339,029. I m y4,1920.

3 SHEETS-SHEET lc. L. HUST 0N. DO-UBLE HEAD MILLING MACHINE.

APPLICATION FILED APR. 20, I918.

2 m X m M [W h APPLICATION FILED APR.20 I918.

4,1920. 3..SHEETS-SHEET 3.

Patented May jw nzs lg Zoe's 6 MW CHARLES L. HUSTON, OF GOATESVILLE, PENNSYLVANIA.

DOUBLE-HEAD MILLING-MACHINE.

Specification of Letters Iatent.

Patented May 4, 1920.

Application filed April 20, 1918. Serial No. 229,718.

To all whom it may concern: I l

Be it known that 1, CHARLES L. HUsToN, a citizen of the United States, and a resident of Coatesville, county of Chester, State of Pennsylvania, have invented certain 1mproveInents in Double-Head Milling-Hachines, of which the following is a specification.

My invention relates to certain improvements in milling machines particularly adapted for accurate work and in which both sides of a test piece, slab, or other articles to be milled, are milled simultaneously.

The invention is particularly adapted for use in milling test pieces, which must be accurate, and in which the milled surfaces must be parallel.

In the accompanying drawings:

Figure 1 is a sideview of my improved milling machine;

Fig. 2 is a plan view;

Fig. 3 is an end view partly in section;

Fig. 4 is a vertical sectional view on the line 44, Fig. 2;

Fig. 5 is a detached side view of the chuck, or carrier, for the test piece;

Fig. 6 is an end view of the same;

Fig. 7 is a sectional view on the line 77, Fig. 5;

Fig. 8 is a sectional View on the line 88, Fig. 5; and

Figs. 9 and 10 are views of modifications of the chuck.

Referring to the drawings, 1 is the base of the machine havingways 2 on which are mounted two heads 3 and 4. These heads are moved toward and from each other by screws 5 adapted to nuts 6 on the heads. Each of the screws has a bevel gear wheel 7 at one end meshing with the bevel gears 8 on a transverseshaft 9. At one endof this shaft 9 is a bevel gear wheel 10 meshing with a bevel gear wheel 11 on a shaft 12 adapted to bearings 13 secured to the base 1. In the present instance, this shaft is turned by hand. On the opposite end of the shaft from the bevel gear wheel. 11 is a bevel gear wheel 14 meshing with a bevel gear wheel 15 on a shaft 16 or. which is a hand wheel 17 sothat, on turning this hand wheel in one direction, the heads 3 and 4 will be moved toward each other and, on turning inthe opposite direction, the heads will be separated; Carried by the head 3 is a shaft 18 on which is a milling cutter 19 and on the head 4 is a shaft 20 having a milling cutter 21. The cutter shafts are mounted in bearings in the heads and each has a flanged coupling disk 22 and 23, respectively. Mounted in the bearings in the head 3 is a short shaft 24 and mounted in bearings in the head 4 is a short shaft 25. On each of these shafts is a coupling disk recessed to receive the ribs on the disks 22 and 23, respectively, so that the two shafts carrying the milling cutters must turn with the shafts 24 and 25. As the two heads are movable toward and from each other, suitable means must be used for driving these heads in any position to which they are adjusted, and I provide a fixed frame 26 having bearings 27,

28 for the twoshafts 29 and 30 respectively,

which are connected to the shafts 24 and 25,

respectively, by spindles 31 and 32 having swiveled heads at each end where they are coupled to the shafts so that while the shafts 29 and 30 are fi-Xedin respect to each other, the shafts 24 and 25 can be moved toward and from each other to a limited extent. The two shafts 29 and 30 are geared together by gears 33 and 34 and on the shaft 29, in the present instance, is a gear wheel 35, which meshes with a pinion 36 on the shaft 37 adapted to bearings in the frame 26, and on the opposite end of this shaft 37 is a gear 38, which meshes with a pinion 39 on the shaft 40 of an electric motor 41, in the present instance, although it will be understood that-any othertype of motor may be used without departing from the essential features of the invention. I

42 is an overhanging frame, which is secured to the base 1 and in this frame are slideways 43 for the work-carrying slide 44. On this slide is a nut 45 through which passes a feed screw 46 mounted in the overhanging frame 42 and on the upper end of this feed screw. is a bevel gear wheel 47 meshing with a bevel gear wheel 48 on a.

gear wheel 57 meshing with a bevel gear wheel 58 on a shaft 59 mounted in hearings in the base and coupled to a shaft 60 within a gear box 6, the gearing in this box being driven through a belt 62 from the armature shaft 40 of themotor 41.

The chuck, or carrier, for the work, in the present instance, is clamped to the work carrying slide by clamp plates 63 and is arranged to pass in between the two milling cutters 19 and 20. The chuck 64L can be made in any suitable manner and can be arranged to hold a number of test pieces, but it will be understood that the means for holding the work may be modified without departing from the essential features of the invention.

If test pieces are to be milled, for instance, they are arranged side by side and secured in the chuck 64k and the frame is then located in the slide 44 and the mechanism is set in motion, the slide being automatically fed between the rollers by the motor through the medium of the gearing shown in the drawings. While the motor also drives the pair of rolls, which can be adjusted toward and from each other by turning the hand wheel 17, this adjustment can also be modified withoutchanging the relation of the gears. By this construction, a more substantial machine can be made than where the slide heads are driven independently by complicated mechanisms.

Furthermore, by making the two cutters substantially as illustrated in the drawings, the drive can be readily connected to the cutter shafts and the work fed vertically between the cutters.

Moreover, the machine is so designed that a carrier, or frame, holding the test piece can be located quickly and locked in the slide and readily removed when the cut is finished. A machine of this type is accurate, as both sides of the test piece are cut at the same time, insuring true cross sections.

The chuck 64, illustrated in detail in Figs. 5 and 6, consists of two side frames 65-65 Each side frame has lateral extensions 66 at the top and bottom to which the screw rods 67 are pivoted. These rods are connected by turn buckles 68 so that when the test pieces :0 are placed in position and the turn buckles manipulated, the pieces are rigidly clamped to the chuck.

A sleeve 69, shaped as shown, inclosesthe lower turn buckle and forms a support for the ends of the central test pieces. This sleeve telescopes with the lower extensions 66 of the side frames, the extensions being cut away to receive the ends of the sleeve, as illustrated in Fig. 7. The upper end of the chuck frame 64: is beveled and the lower end is preferably rounded, as shown in Fig. 6, and is adapted toa rounded seat in the work carrying slide 442 so that it can be rocked into place and held by the clamps 63.

In place of the chuck illustrated in Figs. 5 to 8, inclusive, I may use a chuck as shown in Figs. 9 and 10, which consists of two side frames having extensions at the top and bottom, one section having tongues at the ends of the extension and the other having grooves into which the tongues extend. The two frames are clamped to the work by bolts or screw rods 67, and the chuck is held to the work carrying slide, as shown, by clamp screws and clamp plates.

I claim:

1. The combination in a double head milling machine, of a base; two heads mounted on the base; means for moving the heads toward and from each other; guideways; a workcarrying slide adapted to the guideways; means for vertically feeding the work-carrying guide; a horizontal milling cutter on each head, one milling cutter being arranged opposite the other; a fixed frame; two shafts on the fixed frame; gearing connecting the shafts so that they will turn in unison; means for driving one of said shafts: a spindle connecting each shaft with its milling cutter, the joint between the shafts being swiveled to the spindles so that the heads carrying the cutters can be moved toward and from each other without interfering with the gearing.

2. The combination in a double head milling machine, of a base; horizontal slideways on the base; two heads mounted on the slideways; a screw mounted in each slideway; nuts on the heads through which the screws extend; a hand wheel geared to the screws so that they will be turned in unison to move the heads toward and from each other; a shaft mounted in bearings on each head, said shafts being on the same plane; a milling cutter on each shaft; a fixed frame at one side of the base; two shafts mounted in bearings on the frame; gearing connecting the two shafts so that they will turn in unison: spindles extending from one end of said shafts to one of the milling shafts and another spindle connecting the other shaft to the other milling shaft; swiveled couplings between the spindles and the shafts; power mechanism for driving said shafts; a vertically arranged slide; an overhanging hearing in which the slide is mounted; means for holding the work in said slide; a feed screw on the bearing; a nut on the slide through which the feed screw extends; and gearing between the power mechanism and the feed screw so that the slide is fed simultaneously with the rotation of the casing.

3. The combination in a milling machine, of the milling cutters; a work-carryiiig slide; a chuck mounted in theslide, said chuck having two U-shaped side members between which the pieces to be milled are mounted; and means for drawing said members together to clamp the pieces in the chuck.

4:. The combination in a milling machine,

of the milling cutters; an open carrying frame; means for moving the frame between the cutters; a chuck adapted to the frame; said chuck having two side members between which the test pieces are clamped; means for drawing the two side members together to clamp the test pieces; a sleeve inclosing the lower means and forming a support for the lower end of certain of the test pieces, the chuck being open so that the two milling machines will cut the test pieces simultaneously.

5. The combination in a milling machine, of a milling cutter; a work-carrying slide;

a chuck having an opening for the reception of a chuck, the lower edge of the opening being rounded and the upper edge being beveled; a chuck adapted to the opening and having a round lower edge and a beveled upper edge to fit the opening in the workcarrying frame, said chuck having side members; screws attached to the side members; turn buckles mounted on the screws and arranged to draw the side members and clamp the work, which is located between the side members.

In witness whereof I aflix my signature.

CHARLES L. HUSTON. 

